THE REGULARITY OF SOLUTIONS FOR NONLINEAR DEGENERATE ELLIPTIC BOUNDARY VALUE PROBLEM

This paper is devoted lo the study of regularity of solutions for Dirichlet probelm ofnonlinear degenerate elliptic equations in two dimensional case. A sufficient condition fortheir solutions in C~(3+α)(Ω) to be certainly in C~∞(Ω) is given.     

On the Solutions of a Singular Nonlinear Periodic Boundary Value Problem

In this paper, we consider the following singular nonlinear problem

非线性椭圆型边值问题解的存在性

Hilbert空间方法被用于一类二阶半线性椭圆型边值问题并得出了某些条件下的解的存在性.     

On Positive Multipeak Solutions of a Nonlinear Elliptic Problem

In this paper we continue our investigation in [5, 7, 8] onmultipeak solutions to the problem –²u+u=Q(x)|u|^q–2u, xR^N, uH¹(R^N) (1.1) where = ^N_i=1²/x²_i is the Laplace operator in R^N, 2 < q < for N = 1, 2, 2 < q < 2N/(N–2) for N3, and Q(x)is a bounded positive continuous function on R^N satisfying thefollowing conditions. (Q₁) Q has a strict local minimum at some point x₀R^N, that is,for some > 0 Q(x)>Q(x₀) for all 0 < |x–x₀| < . (Q₂) There are constants C, > 0 such that |Q(x)–Q(y)|C|x–y| for all |x–x₀| , |y–y₀| . Our aim here is to show that corresponding to each strict localminimum point x₀ of Q(x) in R^N, and for each positive integerk, (1.1) has a positive solution with k-peaks concentratingnear x₀, provided is sufficiently small, that is, a solutionwith k-maximum points converging to x₀, while vanishing as 0 everywhere else in R^N.     

椭圆型方程组边值问题近似解的收敛性

本文研究了在矩形域内四阶系数不连续的椭圆型方程组边值问题近似解的收敛性问题,这对某一类弹性支承上的矩形板弯曲问题有参考价值。     

Multiplicity of Solutions to Nonlinear Boundary Value Problem with Nonlocal Boundary Condition

In this paper the author considers the following nonlinear boundary value problem with nonlocal boundary conditions $[\left\{ \begin{array}{l} Lu \equiv - \sum\limits_{i,j = 1}^n {\frac{\partial }{{\partial {x_i}}}({a_{ij}}(x)\frac{{\partial u}}{{\partial {x_j}}}) = f(x,u,t)} \u{|_\Gamma } = const, - \int_\Gamma {\sum\limits_{i,j = 1}^n {{a_{ij}}\frac{{\partial u}}{{\partial {x_j}}}\cos (n,{x_i})ds = 0} } \end{array} \right.\]$ Under suitable assumptions on f it is proved that there exists $t_0\in R,-\infinityt_0, at least one solution at t=t_0 at least two solutions as t相似文献   

非线性椭圆方程等值面边值问题熵解的存在性和正则性

本文研究了非线性椭圆方程等值面过值问题摘解的存在性和正则性,并改进了以前的结果。     

一类非线性椭圆边值问题解的存在性

目前 ,对 s——拉普拉斯算子△s的研究是较为活跃的数学课题 .原因在于算子 -△s与许多物理现象有关 .比如 :反射扩散问题 ,石油提取问题等等 .基于此因 ,在文 [3]的基础上 ,我们将继续研究以下非线性边值问题在 Ls(Ω) ,( 1 2 nn+1 )中解的存在条件 .-△su +g( x,u) =f几乎处处在Ω中-〈 ,| u|s- 2 u〉 =0几乎处处在Γ上其中 f∈Ls( Ω)给定 ,Ω Rn( n 1 ) ,△su=div( | u|s- 2 u) ,g∶Ω× R→ R满足 Caratheodory条件 .本文把文 [3]关于非线性边值问题 @在 Lp( Ω) ( 2 p<+∞ )空间中解的存在性的研究推广到 Ls( Ω) ( 1 2 nn+1 )空间中 .     

p-Laplace非线性两点边值问题多个正解的存在性

本文利用一种新的三个泛函不动点定理得到了p-Laplacian方程在具有非线性边值条件时至少存在三个正解的充分条件,并且举了一个简单例子来说明得到的结论．     

On the Positive Solutions of a Nonlinear Fourth-order Boundary Value Problem with Two Parameters

The existence of m positive solutions is proven for a nonlinear fourth-order boundary value problem with two parameters, where m is an arbitrary natural number. This kind of fourth-order boundary value problems usually describes the equilibrium state of elastic beam where both ends are simply supported. The main ingredient is Krasnosel'skii fixed point theorem of cone expansion–compression type.     

非线性二阶三点边值问题系统正解的存在性

考虑二阶三点边值问题系统-u"=f(t,v),t∈(0,1),-v"=g(t,u),t∈(0,1),u(0)=αu(η),u(1)=βu(η),v(0)=αv(η),v(1)=βv(η),其中f,g∈C([0,1]×R+,R+),g(t,0)(=)0,η∈(0,1)且0＜β≤α＜1.首先给出了线性边值问题的Green函数;其次,给出了Green函数的一些很好的性质;最后,运用锥上拉伸与压缩不动点定理研究了上述边值问题系统至少一个或多个正解的存在性.     

一类非线性m-点边值问题正解的存在性

设α∈C[0,1],b∈C([0,1],(-∞,0)).设φ(t)为线性边值问题 u″+a(t)u′+b(t)u=0, u′(0)=0,u(1)=1的唯一正解.本文研究非线性二阶常微分方程m-点边值问题 u″+a(t)u′+b(t)u+h(t)f(u)=0, u′(0)=0,u(1)-sum from i=1 to(m-2)((a_i)u(ξ_i))=0正解的存在性.其中ξ_i∈(0,1),a_i∈(0,∞)为满足∑_(i=1)~(m-2)a_iφ_1(ξ_i)<1的常数,i∈{1,…,m-2}.通过运用锥上的不动点定理,在f超线性增长或次线性增长的前提下证明了正解的存在性结果.     

一类二阶非线性边值问题的正解

利用Kransnosel′skii锥拉伸锥压缩不动点定理及不动点指数理论,讨论了一类二阶非线性边值问题u″+a(t) f (u) =0 ,t∈(0 ,1 ) ,αu(0 ) -βu′(0 ) =0 ,γu(1 ) +δu′(1 ) =0 正解的存在性与多重性.函数a允许在端点t=0和t=1具有奇性.     

一类奇异的椭圆边值问题正解的存在性

本文主要目的是证明一类奇异的椭圆边值问题正解的存在性,开拓了H．Usami于1989年所得的部分结果.     

一类奇异非线性三点边值问题的正解

应用锥上的不动点定理，建立了奇异非线性三点边值问题(u″(t)+a(t)f(u)=0,0＜t＜1,αu(0)-βu′(0)=0,u(1)-ku(η)=0)正解的一个存在性定理．这里η∈(0,1)是一个常数，a∈C( (0,1),［0,+∞)),f∈C(［0,+∞),［0,+∞))     

负指标情形的非线性椭圆型复方程的非线性Hilbert边值问题

本文研究非线性椭圆型复方程的非线性Hilbert边值问题: W_=H(Z,W,W_),Z∈G:|Z|<1 Re[Z~(-u)W(Z)]=φ(Z,W(Z))+Re[λ_o+sum from k=1 to (|n|-1)(λ_k+iλ_(-k)Z~k)],Z∈Γ:|Z|=1,n<0. 通过建立先验估计及运用与Newton迭相结合的嵌入方法,证明了上述问题在空间C~(1+a)()(0<α<1)中的解存在且唯一。     

非线性三阶边值问题反对称变号解的无穷可解性

利用Krasnosel′skii不动点定理及延拓正(负)解的方法,证明了一类非线性三阶三点边值问题,当其非线性项满足某些假设条件时,具有无穷多个反对称变号解.     

在环形区域上的半线性椭圆型方程边值问题

该文讨论半线性椭圆型方程在环形区域上的Dirichlet(dirchlet-Neumann)边值问题．     

On a Singular Semilinear Elliptic Boundary Value Problem and the Boundary Harnack Principle

On a bounded C ²-domain we consider the singular boundary-value problem 1/2u=f(u) in D, u _D =, where d3, f:(0,)(0,) is a locally Hölder continuous function such that f(u) as u0 at the rate u ^–, for some (0,1), and is a non-negative continuous function satisfying certain growth assumptions. We show existence of solutions bounded below by a positive harmonic function, which are smooth in D and continuous in . Such solutions are shown to satisfy a boundary Harnack principle.     

非线性分数微分方程边值问题正解的存在性(英文)

In this paper,we study a Dirichlet-type boundary value problem（BVP） of nonlinear fractional differential equation with an order α∈(3,4],where the fractional derivative D^α_o⁺is the standard Riemann-Liouville fractional derivative.By constructing the Green function and investigating its properties,we obtain some criteria for the existence of one positive solution and two positive solutions for the above BVP.The Krasnosel’skii fixedpoint theorem in cones is used here.We also give an example to illustrate the applicability of our results.